Struts2获取前台页面输入信息（Struts2+Extjs-combobox组件）
1. 解决的问题
1）eclipse的Build Path引入User Library里面的struts2 jar包后，还要复制这些jar包到WEB-INF的lib下面
2）struts.xml里面DTD引入的配置，Window-Preferences-XML Catalog-add，在location里面添加自己的DTD路径
我们的DTD文件获得可以通过解压struts2 jar包下的：struts2-core-2.3.24.1.jar获得，
①Location：（你的struts-2.3.dtd的路径）
②Key type：Public ID
③Key：http://struts.apache.org/dtds/struts-2.3.dtd（复制这个添加进去）
3）struts.xml里面action格式：我没有加method弄了半天得不到前台的数据shuz，多亏朋友帮忙
<action name="loadLineName" class="com.lineStatus.action.lineStatusAction" method="loadLineName"></action>
4）前台页面Extjs写的，组件里面store定义总出问题，最后写成这样，好像还是用Ext.Ajax.request好些
store:Ext.create('Ext.data.Store',{
fields:['lineName'],
proxy:{
type:'ajax',
url:'\loadLineName.action',
reader:{
type:'json',
root:'lineName'
}
}
})
2. 没有解决的问题：
1）extjs的combobox组件从前台页面下拉框里面至少输入4个字符才会发送请求到action，不解，难道是默认的？
2）extjs前台页面请求的方式默认是get，但请求的url参数值是query，如下：
Request URL:
http://localhost:8080/ExtjsDemo01/loadLineName.action_dc=1458266498448&query=sdfssss&
page=1&start=0&limit=25
3）这个只是前台数据到后面，后面到前面没有
3. 代码：
1）extjs页面：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>form</title>
<link rel="stylesheet" type="text/css" href="ext-4.2.1/resources/css/ext-all.css" >
<script type="text/javascript" src="ext-4.2.1/bootstrap.js"></script>
<script type="text/javascript">
Ext.onReady(function(){
Ext.create('Ext.window.Window',{
title:'Preferences',
width:400,
height:300,
layout:'fit',
resizable: false,
items:
Ext.create('Ext.tab.Panel',{
renderTo:Ext.getBody(),
items:[{
title:'A',
items:[{
xtype:'combobox',
width:300,
fieldLabel:'MFG Line',
store:Ext.create('Ext.data.Store',{
fields:['lineName'],
proxy:{
type:'ajax',
url:'\loadLineName.action',
reader:{
type:'json',
root:'lineName'
}
}
})
}]
},{
title:'B'
},{
title:'C'
},{
title:'D'
}]
})
}).show();
});
</script>
</head>
<body>
</body>
</html>
2）web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>ExtjsDemo01</display-name> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
3）struts.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "http://struts.apache.org/dtds/struts-2.3.dtd" "struts-2.3.dtd" > <struts> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <action name="loadLineName" class="com.lineStatus.action.lineStatusAction" method="loadLineName"> <!-- <result name="error">/pages/error.jsp</result> --> </action> </package> </struts>
4）action
package com.lineStatus.action;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class lineStatusAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private String lineName;
public String getLineName() {
return lineName;
}
public void setLineName(String lineName) {
this.lineName = lineName;
}
public void loadLineName(){
//三种取数据方式
//①
//System.out.println(this.query); //ognl方式？要query的set和get方法
//②
/*ActionContext context=ActionContext.getContext();
Map parameterMap=context.getParameters();
String lineNames[]=(String[]) parameterMap.get(“query”);
System.out.println(lineNames[0]);*/
//③
ActionContext context=ActionContext.getContext();
HttpServletRequest request = (HttpServletRequest)context.get(ServletActionContext.HTTP_REQUEST);
String lineNames=request.getParameter("query");
System.out.println(lineNames);
}
}